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# encoding: utf-8
module Origin
# The key is a representation of a field in a queryable, that can be
# expanded to special MongoDB selectors.
class Key
# @attribute [r] name The name of the field.
# @attribute [r] block The optional block to transform values.
# @attribute [r] operator The MongoDB query operator.
# @attribute [r] expanded The MongoDB expanded query operator.
# @attribute [r] strategy The name of the merge strategy.
attr_reader :block, :name, :operator, :expanded, :strategy
# Does the key equal another object?
#
# @example Is the key equal to another?
# key == other
# key.eql? other
#
# @param [ Object ] other The object to compare to.
#
# @return [ true, false ] If the objects are equal.
#
# @since 1.0.0
def ==(other)
return false unless other.is_a?(Key)
name == other.name && operator == other.operator && expanded == other.expanded
end
alias :eql? :==
# Calculate the hash code for a key.
#
# @return [ Fixnum ] The hash code for the key.
#
# @since 1.1.0
def hash
[name, operator, expanded].hash
end
# Instantiate the new key.
#
# @example Instantiate the key.
# Key.new("age", "$gt")
#
# @param [ String, Symbol ] name The field name.
# @param [ Symbol ] strategy The name of the merge strategy.
# @param [ String ] operator The Mongo operator.
# @param [ String ] expanded The Mongo expanded operator.
#
# @since 1.0.0
def initialize(name, strategy, operator, expanded = nil, &block)
@name, @strategy, @operator, @expanded, @block =
name, strategy, operator, expanded, block
end
# Gets the raw selector that would be passed to Mongo from this key.
#
# @example Specify the raw selector.
# key.__expr_part__(50)
#
# @param [ Object ] object The value to be included.
# @param [ true, false ] negating If the selection should be negated.
#
# @return [ Hash ] The raw MongoDB selector.
#
# @since 1.0.0
def __expr_part__(object, negating = false)
value = block ? block[object] : object
expression = { operator => expanded ? { expanded => value } : value }
{ name.to_s => (negating && operator != "$not") ? { "$not" => expression } : expression }
end
# Get the key as raw Mongo sorting options.
#
# @example Get the key as a sort.
# key.__sort_option__
#
# @return [ Hash ] The field/direction pair.
#
# @since 1.0.0
def __sort_option__
{ name => operator }
end
alias :__sort_pair__ :__sort_option__
# Convert the key to a string.
#
# @example Convert the key to a string.
# key.to_s
#
# @return [ String ] The key as a string.
#
# @since 1.1.0
def to_s
@name.to_s
end
end
end
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